gcc/libstdc++-v3/include/bits/regex_cursor.h

93 lines
2.5 KiB
C++

// class template regex -*- C++ -*-
// Copyright (C) 2010 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/**
* @file bits/regex_cursor.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
namespace std
{
namespace __regex
{
// ABC for pattern matching
struct _PatternCursor
{
virtual ~_PatternCursor() { };
virtual void _M_next() = 0;
virtual bool _M_at_end() const = 0;
};
// Provides a cursor into the specific target string.
template<typename _FwdIterT>
class _SpecializedCursor
: public _PatternCursor
{
public:
_SpecializedCursor(const _FwdIterT& __b, const _FwdIterT __e)
: _M_b(__b), _M_c(__b), _M_e(__e)
{ }
typename std::iterator_traits<_FwdIterT>::value_type
_M_current() const
{ return *_M_c; }
void
_M_next()
{ ++_M_c; }
_FwdIterT
_M_pos() const
{ return _M_c; }
const _FwdIterT&
_M_begin() const
{ return _M_b; }
const _FwdIterT&
_M_end() const
{ return _M_e; }
bool
_M_at_end() const
{ return _M_c == _M_e; }
private:
_FwdIterT _M_b;
_FwdIterT _M_c;
_FwdIterT _M_e;
};
// Helper funxtion to create a cursor specialized for an iterator class.
template<typename _FwdIterT>
inline _SpecializedCursor<_FwdIterT>
__cursor(const _FwdIterT& __b, const _FwdIterT __e)
{ return _SpecializedCursor<_FwdIterT>(__b, __e); }
} // namespace __regex
} // namespace std
/* vim: set ts=8 sw=2 sts=2: */